Retaining-bar for molding-flasks



(No Model.)

T. J. BRADBERRY. RETAINING BAR FOR MOLDING I'LASKS.

Patented Sept. 19, 1893.

. luvgn'ron WITNESSES UNITED STATEs PATENT Ormcs.

THOMAS J. BRADBERRY, OF SHARPSBURG, PENNSYLVANIA. H

RETAINING-BAR FOR MOLDlNG-FLASKS.

SPECIFICATION forming part of Letters Patent No. 505,155, datedSeptember 19, 1893.

Application filed June 5, 1893. Serial No. 476,554. (No model.)

To all whom it may concern:

Be it known that I, THOMAS J. BRADBERRY,

a citizen of the United States, residing at being on the line y. 1thereof- Fig. 3 is a de-.

tail View illustrating a modified form of the retaining bar. Figs. 4.,5, and V 6 are detail Views showing the manner of attaching the bar tothe flask.

Like numerals refer to like parts Wherever used throughout thisspecification.

In the operation of molding in sand it is necessary to retain the sandin the cope part of the mold and heretofore this has been accomplishedby the use of sticks of wood frequently studded with nails introducedthroughout the sand, or L shaped bars of iron depending from the upperpart of the flask, and by reason of their lack of rigidity, and generalinconvenience such devices have been found to accomplish the desiredresult in an imperfect and unsatisfactory manner. The object of myinvention is to overcome these difficulties, and it consists in animproved construction of retaining bar having the advantages ofsimplicity, economy, ease of handling and the highest efficiency for thepurpose desired, presenting great frictional contact to the sand, andthus resulting in an increased retaining power. By reason of the edgesof the bar being thin and tapering at all its parts, the ramming of thesand by the molder is greatly facilitated and the danger of air pocketsor loose sand is entirely obviated.

Referring to the drawings 2 is the drag part of a mold and 3 is thecope. As shown, the form of casting to be made in the cavity 4 is one towhich my improved bar is peculiarly applicable, as the large body ofsand 5 projecting downwardly from the cope will require a very positiveand rigid support, which must necessarily exist in its body, it beingimpossible to support it from the outside.

The bar is rigidly and permanently secured to the flask by means of theplates 6 which are screwed or otherwise attached to the inner face ofthe flask embracing the wedge shaped lugs 7 formed integral with thebar, thereby effectually preventing its displacement. For the purposesof 'my invention it is preferable that the lower edge of the bar shouldconform as nearly as practicable to the lower face of the mold, and itwill be understood that in the manufacture of large numbers of castingsfrom the same pattern, special bars will be used. The bar consists of athin plate of metal A having a series of openings 8 through its bodyportion, and provided with downwardly projecting arms 9' and recesses 10the object of which is to present frictional faces to the sand, tendingto retard its movement. The arms 9 are preferably made narrow at theircentral portion and at the bottom are flared out to give support to thesand, while the recesses 10 and the openings 8 are wider at the top thanthe bottom for the same purpose.

In order to further increase the holding power of the bar I prefer toform grooves 11 curved in conformity with the edges of the arms 9 and Vshaped in cross section, thereby facilitating the packing of the sand bythe molder, increasing its holding power, and permitting of easycleaning of the flask after the operation of casting. When the sand iscompressed around the bar by the fingers of the molder in the operationof filling and packing the mold, it is obvious that a V shaped groovewill be more readily and easily filled than a groove of other shape incross section, such as square or round, and I therefore prefer suchform. It will be seen that all of the edges of any parts of the barwhich are exposed to the sand are also V shaped, for a like reason, andthis feature is an important one to the successful operation of myinvention. It is not necessary that the bar shall be obvious that I mayvary the size at pleasure to suit the requirements of the flask. Anynumber may also be used and their posit-ion in the flask be regulated bycircumstances.

The operation of my device is obvious and its advantages will beappreciated by those skilled in the art to which it pertains.

I am aware that it is not new to insert retaining bars or otherobstacles in the sand of a molding flask to sustain the sand, but my barpossesses advantages not heretofore obtained by any now in use, and suchadvantages I desire to protect by Letters Patent.

. Having described my invention, What I claim is 1. A retaining bar fora molding flask consisting of a metal plate provided with one or moredownwardly projecting arms, narrow at their middle portions and wider attheir termi nations, for the purposes described.

2. A retaining bar for a molding flask consisting of a metal plateprovided with one or more downwardly projecting arms, narrow at theirmiddle portions and Wider at their terminations, and having in the bodyof the bar openings and recesses for the purposes described.

3. A retaining bar for a molding flask consisting of a metal plateprovided with one or more downwardly projecting arms narrow at theirmiddle portions and Wider at their terminations, and having in the bodyof the bar openings and recesses, the edges of all such arms, openingsand recesses being V shaped in cross section, and grooves preferablycurved formed in the face of the arms, substantially as shown.

In testimony whereof I have hereunto set my hand this 25th day of May,1893.

THOMAS J. BRADBERRY.

Witnesses:

F. K. MoOANoE, 0. M. CLARKE.

